Canadian application, no grantCanada
Duckbill valve with crescent shaped lips
CA 2315935 A1 · Owner: Unilever Plc · Inventors: Bennett, Robert Alfred
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A duckbill valve (2) is provided based on a valve seal with a hollow cylindrical body (4) with first (6) and second (8) ends the first end having , an open mouth (12) the second end having a closable mouth circumscribed by a pair of crescent shaped lips.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed December 22, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 22, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 22, 2020.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 22, 1998
GrantedNo grant recorded
Term endedDecember 22, 2018
Patent numberCA 2315935 A1
Classification (IPC)F16K15/14
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.